davis



L. R. DAVIS CUSHION TIRE May 6 1924.

Griginal Filed May 4. 1923 2 Sheets-Sheet l 31413014501 LHURENCE R. DAV/s May 6 1924. 1,493,190

L. R. DAVIS CUSHION TIRE Original Filed May 4, 1923 2 Sheets-Sheet 2 2 9: 5 Suva lion LAURENCE P. DAV/5 351; Mm abhor/14% aflllitented May 6,

warren s1 Ares imam PATENT 1 LAURENCE k-DAVIS, OF -NEW YORK, N.

Y cosmos man.

Orlrlnal application filed Key], 1828, Serial No. 680,582. Divided and this aoulicattm filed January 81, i

- 1924. Serial Io. 889,68

1 To alliwhom it may concern Be itknownthat I, Laurence Rn DAVIS, a citizen of the United States, and a resident I of New York city, county of New York, and -Steteof New York, have invented certain new and useful Im rovements in'a Cushion Tire, of which the ollowingis a full, clear, and exact description.

' This invention relates to solid tires. more specifically that type thereof known as cushions. and this application is a division ogianother, Serial No. 636,532, filed May 4th,

'1 23. Cushion tires having rubber body portions vulcanized to metallic base or rim sections 1 as heretofore. manufactured with cores which were wit-hdrawn after vulcanization,

' either through walls in the metallic base sections or by tem orarily spreading the metallic basesections have had a continuous and unbroken tread tying together their side avails or leg portions.

The present invention contemplates a tire awhose rubber body portions are sha ed in- :ternallly to define, when assemble on a wheel, an internal cushioning formation sur- 1 mounted by independent tread portions overh'angin-g the metallic base scctionsnnd contasting, referably withcompression, so as bozexc u e the entrance of dirt stones or other ioreign matter'into the cavity, without :viimpairing theindepende'nce of action of the 1se,vera,l rubber bodyzportions. The tire. may' xii fnnction as asibgle cushion tire. or as dual icushion tires, but in both cases, the crack or ==...cr-acks at the tread between the rubber body ismaintainedclosed. The tire of this invenwtion may be vnlcanizedreadily in a fiactory riwithout thetroublesome operation at remov- "Qningrcores (the operations [being similar 'to M1986 used for years in removing vulcanizing i mmoldsections). The tirefsectlions, may be mvn-lcanized with very satisfactony uniform= ity. Two oc-moretireesection ma? ,jbe as- Mnbmbled on a; wheel. with or :Wlfiwll Ir'a .fa'sr .-1to'nin together-of their metallic base sections f (ifwt are are two, preferably without. any

\ Wench-fastening). And any desired internal rccushioning formation may be obtained with Q almost ual facility.

r Em iment-s of the invention are illustrated in the accompanying drawings, in which Figure 1 is a cross-section showing vulcanizable rubber massed on a metallic basemeinber ready for vulcanization;

Figure 2 is a cross-section of a complemem tary tire section as it appears in a, vulcanizm mold;

igures 3, 4 and 5, are cross-sections of 90 multipleart cushion tires as they would appear w ien pressed fast to the v'tclilyvlluul of a wheel in working relation;

Figure 6 is a perspectiveof a single tire section showing a modified cushioning formation and also a typical treaddesign;

'Figure 7 is a perspective of an. intermediate tire section; And Figure 8 illustrates a further modilied form of complementary section.

According to the invention, amass of relatively soft rubber l. of any suitable vulcanizable composition, and a stratumoi relatively hard rubber 2 are assembled. as convenient, on a metallic base member 3 a The assemblage is then introduced within the sections 4 and 5 of a mold, thelatter carrying, as shown. a device or devices 6, for imparting a cavity formation of ovoidal, triangular, rectangular. or other desired shape, to one side or face of the rubber body; While the mold sections are held closed. the tire is subjected to suitable heat treatment and is completely vulcanized in a finished condition on its metallic base member. "Thus, one [at the complementary sections 7 of the tire is completed." Similarly. another section 8 may be manufactured in identically the same form. Intermediate sections, such] as indicated-fat- 97in Figure 7, may likewise be. built and cured in sectional molds With,"l1ow-; ever, curing devices similar to that shown at 6 located in shaping relation to both sides of the section. It will be noticed that when the tireis ll y cured. the parts iif themold and, the-wore may be removed bydisplacement'laterally. of the tire section rather han-as; heretofore by an inward radial movements 4 ssunplifies the vulcanizin'g operation in thef'factory very much, cheapens the cost of p oduction materially, and enables the heat to been) plied to the mass of rubber in a manner, insuring uniform vulcanization and a reliably cured tire section.

The curing device or core 6 is preferably, but not necessarily, made integral with one of the sections of the mold and annular in form. Its cross-section may be as shown or of any desired shape whatever. Instead of an annular form, however, a series of pins or projections (not shown) may be cmployed to indent the inside or meeting faces of the sections. as shown at 10 in Figure 8 of the drawings.

Each of the vulcanized rubber body portions comprises a leg ortion L. and a tread portion T which over iangs the leg portion. .;\n d preferably. but not necessarily. the tread portion projects across and beyond the vertical plane of the inside face of the metallic base section 3 by a slight amount, such as indicated at X, so as to insure a tight joint 11 being n'laintaincd between the contacting surfaces of the tread portions of the several sections. the tread portions being laterally nndcr compression. This feature is desirable also because the metallic base members 3 may not ome together in abutting relation or contact everywhere throughout their periplu-rv when pressed. fast to the felly-band of a wheel. It allows 'the manufacturer greater latitilile in the factory. The relatively narrow stratum of rubber X-which may be and is preferably provided on the outer tire sections and may or may not be provided on the intermediate tire sections 9-insurcs a tight; joint at the trend of the complete mounted tire despite irregularities in the base members and tends at all times to prevent the entrance of dirt, etc.. into thc. cushioning cavity 12, or other cushioning formation that may be provided on the inside face of the section in from the trcadl \Vhcn thecushioningformatiomis of bodics.

course. should be that. necessary to obtain the character illustrated 'in Figure 8. that face may be bevelled or fiarcd out slightly, illustrated, so as to overhang the insi e edge of the metallic base member and thus thc same closure ol'thc division between this the right width of tire ,when two or more of the sect ions are assembled. Preferably, the base members 3 are provided withflanges lti on both margins. but. if desired. these flanges may be omitted on one or. both margins. as illustrated, for 'inst'ance, inFigare 5.- r

When two or more of the complete and vulcanized sections are pressed fast upon the folly-band of a wheel in the relation illustrated in Figures 3, 4 and 5, of the drawsections. Thus in applicants tire, the capabilities of two different ty )es of tires are obtained. In its prcferre form, the 0pposed tread portions of the tire are under compression at the seam 11, each thrusting laterally against the other to maintain a tight joint and exclude foreign matter from entrance into the cushioning formation, whatever it may be. The independent; metallic base members 3 may be, and desirably are. pressed into abutting relation and each may be pressed fast to position on the felly-band of a wheel so as to grip the same tightly and independently of the other. No fastening bolts, keyieces, lockingplates, welding of the metal ic base members together. or other similar expedients, are required ordinariiy, but may be used when and if needed. a

While, in the foregoing, emphasis has been laid upon a closing stratum of rubber between the sections, such as indicated at K, Figure 2, this feature may be omitted it' deslred but not, it is believed, without sacrificing some of the advantages of the iiivention. Optionally,-a'lso, it is within the broad aspects of the invention to cement the seam'll closed with a vu'lcanizable composition of either a cold or hot curing character, but this Ido not; deem desirable. It is. to be understood that the drawings are merely illustrative and that the of the tire sections me be varied widely. In practice, very satis actory service tests have been obtained with sections 4" or more width.

it will be obvious that many changes may he made without departing from the; rincrples underlying the invention. Re erence should there fore be made to the appended claims :for an understanding pf the scope of the invention. In the claims, the term cushion is intended to comprehend solids with an internal cavity formation whether or not the tire is externally grooved. indented. or otherwise shaped. on its' tread surface or side walls, or both, for traction or additional cushioning purposes.

Having thus described my invention. what I claim and desire to protect byLetters Patent is:

1. A cushion tire comprising distinct pomplcmentary sections each having a leg roportions 1,4es,19o

and tread of rubber composition vulcanized to a metallic base member, the metallic base members being adapted to be pressed fast to the felly band of a wheel with said tread portions laterally in contacting relation and said leg portions separated to define an annular internal cavity formation.

2. A cushion tire consisting of distinct complementary sections each having a rubber body vulcanized to a metallic base memher, said sections bein" adapted to be pressed fast onto the fel y in contiguous relation and with portions of their opposed faces in and out of contact the latter defining an internal hollow cushioning formation enhancing the .yielding properties of the tire.

3. A cushion tire consisting of permanent separate complementary sections each having a rubber bod vulcanized to a metallic base member, sai sections being adapted to be pressed fast to the folly band of a Wheel to orm the complete tire, the opposed faces of the rubber bodies of the complementary sections being squeezed to ether at their outer periphery and inward y thereof channeled circumfenentially to define a substantially closed annular cavity augmenting the cushioning properties of the tire.

4. A cushion tire comprising separate and distinct sections, each section consisting of a metallic base member and composition rubber body vulcanized thereto and each of the rubber bodies having a legl portion and a tread portion overhanging e base memband of a Wheel ber, the tread portions being adapted to be held in contact when the sections are mounted on the folly band of a wheel, and the said leg portions being sha ed to define a hollow internal cushioning ormation.

5. A cushion tire comprising separate and distinct sections, each section consisting of a metallic base member and composition rubher body vulcanized thereto and each of the rubber bodies having a leg portion and a tread portion overhanging the base member the tread ions being adapted to be held in route and under lateral compression by the metallic base members when the same are secured fast to the telly band of a wheel in working relation, and the said leg p01- tions being shaped to define when assembled an annular internal cushioning formation.

6. A cushion tire consisting of distinct complementary sections each having a rub-i her body vulcanized to a metallic base men!- ber, said sections being adapted to be pressed fast onto the felly band of a wheel In contiguous relation andhavin portions of their opposed faces inward of t eir treads out of contact to define an internal-cushioning formation enhancing the yieldin properties of the tire, each of said metaliic base members having mar inal flanges con the inner portions 0 the rubber body viifi canized thereto. Signed at New York city County of New York, and State of New York, this 30th day of January, 1924.

' LAURENCE R. DAVIS, 

